The Nightbird was Nightwing's personal form of transportation. He modified it's materials and equipment to match that of the Batmobile, including armor plating, bulletproof glass, a computer uplink, GPS system, and more. He can also easily modify the outside appearance of the car to blend in with the streets of Gotham. Unfortunately, Nightwing's Nightbird was destroyed during a bomb attack by Blockbuster, and he hasn't re-built it since. It seems that, in the end, Nightwing is more comfortable with motorcycles.